Refactor oemcrypto mock into stand alone reference code

Merge from Widevine repo of http://go/wvgerrit/46204
Refactor utility code - split the mock, step 1

Merge from Widevine repo of http://go/wvgerrit/46205
Move some OEMCrypto types to common header - split the mock, step 2

Merge from Widevine repo of http://go/wvgerrit/46206
Split mock into two -- step 3

Merge from Widevine repo of http://go/wvgerrit/47460
Split the mock into two -- step 3.5

The CL moves several files used by oemcrypto and cdm into a common
subdirectory, so that it may more easily be shared with partners.

The CORE_DISALLOW_COPY_AND_ASSIGN macro was moved to its own header in
the util/include directory.

This CL removes some references to the mock from other code, and puts
some constants and types, such as the definition of the keybox, into a
header in oemcrypto.

Test: tested as part of http://go/ag/4674759
bug: 76393338
Change-Id: I75b4bde7062ed8ee572c97ebc2f4da018f4be0c9

libwvdrmengine/oemcrypto/ref/src/oemcrypto_nonce_table.h

@@ -0,0 +1,40 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+//
+//  Ref implementation of OEMCrypto APIs
+//
+#ifndef REF_OEMCRYPTO_NONCE_TABLE_H_
+#define REF_OEMCRYPTO_NONCE_TABLE_H_
+
+#include <stdint.h>
+
+namespace wvoec_ref {
+
+class NonceTable {
+ public:
+  static const int kTableSize = 16;
+  NonceTable() {
+    for (int i = 0; i < kTableSize; ++i) {
+      state_[i] = kNTStateInvalid;
+    }
+  }
+  ~NonceTable() {}
+  void AddNonce(uint32_t nonce);
+  bool CheckNonce(uint32_t nonce);
+  void Flush();
+
+ private:
+  enum NonceTableState {
+    kNTStateInvalid,
+    kNTStateValid,
+    kNTStateFlushPending
+  };
+  NonceTableState state_[kTableSize];
+  uint32_t age_[kTableSize];
+  uint32_t nonces_[kTableSize];
+};
+
+}  // namespace wvoec_ref
+
+#endif  // REF_OEMCRYPTO_NONCE_TABLE_H_